Re: Python interface and Money?

On Monday 22 October 2001 13:45, Joel Mc Graw wrote:
> I have a table that has a column of type money.  A query such as "select
> sum(document_amount) from foo" returns the correct result when executed
> from psql, yet the same query returns the wrong answer (it appears to be
> a rounding issue--something like "1234.9999999999...") when executed
> through PygreSQL.  Is there a workaround or a fix?

The problem is that Python doesn't (yet) have a native decimal type and so the
closest thing we can convert to is float.  There have been attempts at a
decimal type and at some point I will convert to one of them, hopefully the
same one that Python chooses as a standard.

> While browsing the mailing list for an answer to this problem I found
> several references to the money type being deprecated.  Is that the
> problem?

There are people who want to remove it but I still think it serves a useful
purpose.  I think that it needs to move to a 64 bit int and handle a lot more
type conversions but I moved some stuff to numeric due to the limits and
found a noticeable slowdown when working with lots of aggregates on it.  The
int type is just more efficient.  I plan on making a contrib version of the
type before it gets deleted if that is what is decided.

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